Method of making flue-linings.



E. M. CAMPFIELD.

METHOD OF MAKING FLUE UNINGS.

APPLICATION FILED 0m. 9, 1915.

Patented July 3, 191?,

2 SHEETS-SHEET 1.

Witnesses E. M. CAMPFIELD.

METHOD OF MAKING FLUE LlNlNGS.

APPLICATIOH FILED on. 9. I915.

Patented July 3, 1917.

2 SHEETS-SHEET 2.

/A a K Q) @AWA E Witnesses Attorneys,

Ni @TAEfi PATET EDWIN 1W. CAMPFIELD, F RICHMOND, INDIANA.

METHOD OF MAKING FLUE-LININGS.

Application filed October 9, 1915.

To all whom it may concern:

Be it known that I, EDWIN M. CAMP- rinLD, a citizen of the United States, residin g at Richmond, in the county of Wayne and State of Indiana, have invented a new and useful Method of Making F lueLinings, of which the following is a specification.

This invention relates to a method of producing cellular flue linings and the like, it constituting, more especially, a continuation of an application filed by me on January 9, 1914, Serial No. 811,226.

One of the objects of the present inven tion is to provide a flue lining containing air Y cells which are sealed at one end, and a further object is to provide means whereby a cellular flue lining of this type can be formed automatically without danger of distortion due to the creation of vacuums within the cells.

Heretofore it has been impossible to pro duce plastic articles having air cells closed at one end unless the same have been made by slow and tedious processes, because of the formation of partial vacuums during the pressing of the plastic material through the dies and the consequent collapse of the walls.

One of the objects of the invention is not only to produce a cellular tile of novel form, but to produce it in anew and novel manner.

lVith the foregoing and other. objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the in vention herein disclosed, can be made within the scope of what is claimed, without departing from the spirit of the invention.

In the accompanying drawings the pre ferred form of the invention has been shown and one form of apparatus for use in producing the same.

In said drawings Figure 1 is a view partly in side elevation and partly in section of a cellular flue lining embodying the present improvements.

Fig. 2 is a side elevation of a portion of the machine used in producing the flue lining.

Fig. 3 is a central longitudinal section through a portion of the machine and showing the relative positions of the parts during the first stage of the forming operation;

Specification of Letters Patent.

Patented July 3, 1917. Serial No. 55,060.

F ig. 4 is a view similar to Fig. 3 and showing the relative positions of the parts during the completion of the shaping of the lining and while the air cells are being prov duced in the wall thereof.

Fig. '5 is a section on line AB Fig. 4.

Referring to the figures by characters of reference 1 designates the cylindrical casing of a clay press in which is mounted a plunger 2 for forcing the clay through the die provided therefor. One end of the cylindrical casing 1 is tapered as at 3 and merges into a mouth 4 forming the outer wall of the die, the inner surface of said mouth being shaped to produce a flue lining of the desired external contour. An annular flange 5 is provided on the mouth 4 and has hookshaped keepers 6 extended therefrom. Suitably supported within the mouth 4 and the tapered portion 3 of the casing 1,'is the spreading member 7 of the die and project ing between this spreading member and the mouth 4 are the cell forming die members 8. Spreading member 7 is of an external contour and of a transverse area suitable to produce a central opening of desired contour and proportions within the finished flue lining and the inner end portion of the spreading member 7 is tapered, as at 9, so that the plastic material will be deflected readily in all directions into the spaces between the spreading member 7 and the mouth 4. The cell forming die members 8 are so shaped and proportioned as to produce cells of desired areas and cross sectional contours and formed within each of the cell forming die members 8 is an opening 10 extending back into an enlarged recess 11 in which is arranged a spring pressed closure 12 adapted to normally close the opening 10.

Normally fitted against the end of the mouth 4 is a head 13 on the inner face of which is formed a hollow socket forming die 14 adapted, when in its normal position, to fit snugly against the spreading member 7, as shown particularly in Fig. 3. Extending from the socket forming die are small tubes 15 which normally project into the openings 10 so as to press the followers 12 back from the openings, as shown in Fig. 3. An opening 16 is formed in the socket forming die so as to establish communication between the interior of said die and the interior of the spreading member 7, as shown in Fig. 3.

A pipe 17 opens into the interior of the socket forming die 14a and is connected to a flexible supply pipe 18 whereby air under pressure may be directed into die 14.

Extending from the head 18 isa stem 19 on which locking arms 20 are mounted for rotation. These locking arms are arranged close to the outer face of the plate 13 and are adapted to move into engagement with the keeper 6, thus to hold. the socket forming die lt and the plate 13 against movement away from the mouth 4. Stem 1-9 is bolted or otherwise fastened to a head 21 secured to a plunger rod 22.

In using the apparatus herein described,

the parts are assembled as shown in Fig- 3-,

the socket forming die being secured to the month 4: by the keepers 6 and the arms 20. Air under pressure is then admitted tothe socket forming die 1th by way of pipes 18 and 17 and will flow into the hollow spreading member 7 and the recesses 11. The plastic material of which the flue lining is to be made is positioned on the casing 1 and the plunger 2 is moved forwardly by any suitable power so as to cause this plastic material to. press around the spreading member 7 and to fill the spaces around the cell-forming dies 8- and around the socket forming dies: 14;, as shown in Fig. 4. After the plastic material has been thoroughly packed in: this manner, the arms 20 are rotated out of engagement with the keepers 6 and power is applied to the plunger rod 22 in any suitable manner so that the same will be lowered at a speed equal to that of the shaped article issuing from the mouth of the press. It will be apparent that as the plunger 2 continues to. press against the plastic material, it will force the material through the mouth 1 and past the spreading member 7 and the cellforming dies8. Under ordinary conditions this would produce vacuums within the molded object and result in the collapse of said object. To avoid this,v the hollow socket forming die 14 has been provided. As the molded object is produced, air will enter the cells C in the flue lining wall by way of the tubes 15 which are withdrawn from the openings 10 and will enter the central space S formed by the spreading member 7, by

way of the opening 16. Thus the air pressure produced within the molded object will be such as to prevent collapse and, consequently, when a desired length of flue lining has been produced, the same can be cut off in any suitable manner and then lifted. from the plate 13 and the socket forming die- 14.

through the tubes 15 into During the removal of the molded object from the socket forming die, the tubes 15 will be withdrawn from the wall of the molded object, the frictional engagement of these tubes with the wall tending to pull the material into the openings that might otherwise be produced by the tubes 15 and close said openings. Under some conditions, small openings may be left where the tubes 15 were located but these can be readily closed before the molded, object has dried and without requiring any special ski-l1. After the flue lining. has been. removed, the outer portion of that end of the wall remote from the socket or recess R produced theretions of the partitions 1? produced between the air cells and which partitions. act as projecting ribs, the lengths of the exposed portions of the ribs or partitions being equal to the depth of the recess B.

After one length of flue lining has been removed in the manner pointed out, the socket forming die can be returned to its initial position and locked, whereupon. the foregoing operation can be repeated.

By providing the spring pressed followers 12, the openings. 10. are kept closed so that material will not be forced into the openings and interfere with. the. readmission of the tubes 15 into thev openings 10 during subsequent operations.

hat is. claimed is The herein described method of producing fiuev linings or the like having air cells in the walls thereof, said cells being. closed at one end, which consists in packing plastic material through a die for producing a socket, cells spaced from the socket, and a central opening, and then directing air under pressure into the central opening and in the cells during the process. of formation tliereofiand finally cutting off the formed object from thestock and cutting. away the outer wall of the formed object at that end tance equal to the depth of the socket, said exbposed portions of the partitions forming r1 s.

In testimony that I claim the foregoing as my own, I have hereto affixed my signature in the presence of two witnesses.

EDWIN M. OAMPFIELD.

WVitnesses:

Iv Y E. SIMPSON, PHILOMENA A. ROCKELLI.

Copies of this patent may be obtained for live cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

